John h



(No Model.)

J. H. SCHAAL.

FILE CUTTING MACHINE.

No. 251,298. Patented Dec. 20,1881.

FTIELIE I UMI W UNITED STATES PATENT OFFICE.

JOHN H. SGHAAL, OF BALTIMORE, MARYLAND, ASSIGNOR OF ONE-HALF TO JAMES E.GEMMILL, OF SAME PLACE.

FILE-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 251,298, dated December20, 1881. Application filed August 26, 1881. (No model.)

To all whom it may concern Be it known that I, JOHN H. SCHAAL, of thecity of Baltimore and the State of Maryland, have invented certainImprovements in File- Cutting Machines, of which the following is aspecification.

The object of this invention is to provide in a file-cutting machine ayielding support for the chisel-carrier, or device to which the chiselis secured, in order that in the file-cutting operation teeth may be cutapproximating in form to those out by hand in the ordinary manner.

In carrying out my invention I provide the swinging frame in which thechiselcarrier is confined with strips, against which the said carrierbears, the said strips being backed with springs and provided withdevices to limit their inner movement, and thereby prevent clamping orbinding of the chisel-carrier. An alternative construction is had byfitting the chisel-carrier with yieldingface plates or strips andmovement-limiting devices, the adjoining parts of the frame being fixed.

In the further description of my said invention which follows referenceis made to the accompanying drawings, forming a part hereof, andin whichFigure I is a'partly-sectional front elevation of the chisel-carrier,swinging frame, and their attachments. Fig. II is an exterior sideelevation of the principal parts of the machine. Figs. III and-IVillustrate certain modifica-- tions in the construction of thechisel-carrier and swinging frame, as hereinafter described.

Similar letters of reference indicate similar parts in all the views.

regulating-nuts d on the outside A is the stand of the machine, which isof the ordinarydescription. Bis the swinging frame, suspended from thestand A, as is usual in machines of this class; and O is thechiselcarrier, adapted to slide within the frame B.

Referring to Figs. I and II, the swinging frame is provided with stripsa, which are sustained in a position slightly separated from the innersurface of the said frame by means of spiral springs b. The inwardprojection of the strips a is limited by means of bolts c,having headscountersunk in the said strips a, and of the frame.

' ment is not new; but

The required degree of tension of the spiral 5o springs bis effectedthrough the medium of setscrews 6, which bear against the saidsprings,asshownin thedrawings. Thesprings b are preferably contained inremovable cups screwed into the frame; but the same result is producedby merely forming cavities for the springs in the sides or walls of theframe, the said cavities extending only partially through the walls, aswill be readily understood. In adjusting the swinging frame for thereception of the chisel-carrier the space between the strips a is firstregulated by means of the bolts 0, so that the chisel-carrier may bemoved freely therein. The required tension is then placed upon the saidstrips through the medium of the set-screws e, which, as before stated,bear against the ends of the spiral springs b. By this means theelasticity of the walls of the swinging frame can be increased ordiminished without varying to any extent the pressure on thechisel-carrier.

In Fig. III the result as above described is effected by attaching astrip, a, to one side of the chisel-carrier by means of bolts similar tothe ones 0 before referred to, and placing the springs bin depressionsin the said carrier, and

between the same and the strip. A liner, 9, is set up by set-screws togive theproper width of opening to the frame B.

The construction illustrated in Fig. IV is practically the same as thatshown in Fig. III, the only difference being that the carrier is fittedwith two of the strips (it instead of one.

I make no claim of invention to parts of the machine not hereindescribed, as the same are of ordinary construction; neither do I claim,broadly, the introduction of a spring and bearing-strip between thechisel-carrier and the frame in which it moves, as such an arrange- WhatI claim as my invention is 1. In a file-cutting machine, achisel-carrier confined within a suitable frame, combined with one ormore yielding strips situated between the said carrier and its frame,adapted, when adjusted, to yield toward the walls of the frame only,substantially as and for the purpose specified.

2. In a file-cutting machine, the chisel-carrier confined within aframe, having interior strips backed by springs, and devices foradjusting their position in relation to the carrier,

5 substantially as and for the purpose specified.

3. In a file-cutting machine, a frame having interior strips adapted toform a yielding snrface for arresting the vibrations of the containedchisel carrier, the said strips being 10 backed by springs adjustable inposition in relation to the chisel-carrier, substantially as specified.

4:. In combination with the frame B, the strips a, springs 11, cups f,set-screws e, and bolts 01, substantially as and for the purpose 15specified.

J OHN H. SGHAAL. Witnesses:

Jim. T. MADDOX, J. D. HOWARD.

